Dao工厂类

import java.io.IOException;
import java.util.Properties;

public class DaoFactory {

private static Properties props = new Properties();

static {
	try {
		props.load(DaoFactory.class.getClassLoader().getResourceAsStream("dao.properties"));
	} catch (IOException e) {
		e.printStackTrace();
	}
}

/**
 * daoName
 * @param daoName
 * @return
 */
public static Object getInstance(String daoName) {
	String daoname = props.getProperty(daoName);
	// 通过反射用全路径名获取实例
	Object o = null;
	try {
		o = Class.forName(daoname).newInstance();
	} catch (InstantiationException e) {
		e.printStackTrace();
	} catch (IllegalAccessException e) {
		e.printStackTrace();
	} catch (ClassNotFoundException e) {
		e.printStackTrace();
	}
	return o;
}

}

dao.properties文件配置

userDao = com.yanglei.daoImpl.UserDaoImpl
…